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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe40cbd1843c903b026d6627d315c39208223e8128314c4eb58b95d68af4680' 
  AND token = 'HMxfsre/SoL/ldmJpWXnfDBqNjZTDV92W6LewSR247k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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