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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bf20c1426ea3b0bcebf1314fd7c5ba6d7cbb3e7d1ecb52d7a07e87cb528423' 
  AND token = 'cgQRGk09HUHvB7APMthrode2FotBmp76GQrlDctb+rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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