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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074801be0a3967e746d0f4084fe3a52d018cab37ac429f1afcc9a4e24711a57b' 
  AND token = '/eNip5EmTQNWiBEbyD83ph9+U2Buehe19+KSGKCOOLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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