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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7310ef09edd3dd99652aeb66891a9a3fca8bfef4ee5c1d2f16ad9542532ecce' 
  AND token = '46Uqla/W57fxZ5mpJIojjbkBkL5g38wQCISelvaPCu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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