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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f945b87e66419328b0c25a9a26fd9d6383260bde07a522e749c86e8e2f8040' 
  AND token = 'AXVKQ45JwaAB2M6OAS5xCSU12+VEY7RvT5xNQSFoeiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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