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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943b72e2aceff3df674611b1d679a736490c27612bb5eca14aea3446f27046f8' 
  AND token = 'CdICbHKVgJxbzVY1MH86Ihmlg4S2s6waIxCahVik2UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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