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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04c6fe8c3c2be3e0b770bcf14c19b1f4474b2d767ae316714facd02df49b912' 
  AND token = 'bfViisU1I4M388BGyRpLO6NN5Gjn0vyd+0lIvh58AU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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