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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879853dcaacbb8ba41e849d098f652fdfce85559bd6add331316a0f3b29acf32' 
  AND token = 'p3SwPoP3bi2IJ4T4uHd+SRa7l7w0MYiU2kx38AScfhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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