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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96468138d46c9d6e323ed99bd479456bc7655156eea5b41e8970e2dd16459cd' 
  AND token = 'fVX7wQig0tSkbUyP5Ko0sVOgDid8aobhUdVI6Tlr3GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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