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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b19a0e265904fbadaf0485eecb3519679af9e6848c10c30a8c44261641b9f0' 
  AND token = '0bOka59sANS/m1F9rHWCKBkYythOap0SrPYSiLhyagA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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