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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1365bb41b7442d4de84b98e997a3cc6807f6caea248990a9ae54145bd68f7046' 
  AND token = '+Y2SBbCkrm0al011vhW38mlN1KohfCR8HVpfdaDiMvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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