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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b136864a5ca23317ac2886ca680930d1f1faf50a7d7093bb43ed08380739da14' 
  AND token = 'cqP1oJnXC6GkrIQutuFoSrTGAkKeNeg2k8ni2cTjevs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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