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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac544ecf9fe613fc6234f3c3e5f1f2e1cba97d48be7ed9d5c0d2bec67f53e9a' 
  AND token = 'e/kKJCkZ52qETYS3K76uN5Kbt2+tvw4oV5Zp4IJXJBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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