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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a362312ba84e367c758177c5dd696f250ea4ba990b1208f2f2c6587304d8b69' 
  AND token = 'bQQFnHOznXuZx761D5CoPCljjlN+5w3PDJyXysI63Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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