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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f28cdaa1ce759b5f4d0eccb53a28ea64cf6130e7f67ae021de6a33549e3ef96' 
  AND token = '1vEdU9jVqQ7u8SlCcYcsSk766Z18QfAeUi/Pm7GPruE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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