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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b047668a0e0d6202423620b30eff6c3ecc33cb800a26efb9f2c4785f0d0a1f9e' 
  AND token = 'i1s1obTfwGm5EelVitMQJapB72RxbrAlZRWt9HEt/r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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