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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe35756ae64c7d6d59a9b2236ec4a95cbbbcd7c51998c9058ab9e7a031c10c4' 
  AND token = '24+vOyAyI1DdFV8rZJ/h8Uq4MSzV1laW6+4xa4Sjcrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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