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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68463bc0ebe12fbf5d0c02b6ae34226775ac7ccd9b7c81b4956dfd7d7ae6a4f7' 
  AND token = 'vfziBBQEsbnw0ku8Mn1fu2xsRgAetRqsTAbQNciUkQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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