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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d72d958f5edf1d1f8fbde745c26bc1f1b1b2dea2e2b78bcaa4b6362bbb23475' 
  AND token = 'arjC8hr5oTcpNxfwxl2xiPqR50+Y04626DyiSeUDJN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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