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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de09c593055479fc7e12e3dc43c7be761b7dc598a0d6b398949902a2f61086d' 
  AND token = 'xPNX6Dp9FCyDLmhbva3lma/2K3jLlRldmLGt/wD5QQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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