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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e34cde382210e1dc1033e5a3f638a7795e651979ac17c45d6d376f4ba76132' 
  AND token = 'UUIAjQ1/F4kFgpSRwIrqke8gIMhrI4fVeq7khghdNro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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