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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39229c503ca60c2c8e13c277800c5343d58899880a2f4f9db9203744b010d04f' 
  AND token = 'vidpQcHnktQ8WZPOieM4xFHX+8FcNmdUNkbLYhuvnGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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