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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6374dcb4ba505885b61282eecd5420b3e2ee80c7209bf2413bd219783df4bcdc' 
  AND token = 'v2G3tWYaNXR5jCUybAs30lAX7mze91hgTfgifCc8Yh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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