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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056b61cb7de1e5aa5210e9a0229599526cdb7af21c3a697d980d249543a8a4aa' 
  AND token = 'pLIS1xp1ibH/rZu8zf9D6nAZkctzsHD5aWQQhQonvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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