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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21ad9d8711a25576e4bc183ba18670efd6ee09a7c70f756cb92b23423fc3046' 
  AND token = 'ceNJljW70Ftj4oQPqzfEfKZpQjoU0PsiXynPEm9HhwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}