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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ec88bc57a5b6ff7ce0c690d1fbf4dbf7e334df3bf96b2a933a3eb995ac2e44' 
  AND token = 'qYbW8sT/rW17lIRk826pkqpXkbnWVeK/42ueYmkcWO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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