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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf3964a204022f2e9d52e2b94ce1f2dc5a1017386f849c3c6e72795e34be738' 
  AND token = 'hX36AaL7X2Vv97ROMKy+x+na4Rbj1jSgxvhWWemKJbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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