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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de34076a5757d2f8113e68e2b1a67216ac65c7040ba5522c929e83d65dc61a82' 
  AND token = 'xuvKtzgcr+UD12VRfK6r4bIM4uPhauXH80Hl7vEN6SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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