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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fce0e52b74d981b86ad53b9b3e6a5d3f21e4384b1156f633692329d5336de1' 
  AND token = '/9nx8CKVpKA4oFaEv6wHMKLhYET0u3VEBcYw6173AX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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