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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdb47dbe7c5d607a3e459ccc05292445cba0d22dc888aa925dfaf5637f1fc8f' 
  AND token = 'azHNUvB96IQZrEFCCP13rCIavumBevTsK63DrMSUR68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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