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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d4564d5ce37d216d26a7ceeefb9b05c4c62ddd98af57151f7f21b854bfecd5' 
  AND token = 'QDM92wbZIBN5c1D79SYvkxfoWNqvA+NTOg0al6vV984=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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