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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd9d191ae2070c2f9203279b72dda912f31c9d5b4a989f1c6dfd444fd1498e1' 
  AND token = 'c5frgpM1vcnRk7xVDTq2+9fuPHx/v2v11kl2mG4Hp/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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