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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc77df9df037cad612a4df19353f0146c5cafa3a0d53eca2acc4bc787785ef5' 
  AND token = 'f8IFrQgADNflSHvvvqSFzGT7HEEY7r0BRcePgUD1Xfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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