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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be8366331c411146e899c9bb452cb47021bd8dda733666a34c4ec54e32309b4' 
  AND token = 'nl9k84+aQL6QDudHmidATRzUvUeDSMBCOSDXNxC2r/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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