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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d662abef204b3cfb6206eeab071c4bf7bfa5acb34f4736a5d8de4457cdb726' 
  AND token = 'AlxX7OTj2rhE52cTA+yeEqN583KG4WUpCjl0OH38ZX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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