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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b980cc866a75ad4994ea630f32dff915d4cb29f3a99e495f8b3865a98aa4625' 
  AND token = 'R8RRFoASaZy85eee5NWLYQHzoaMpgxBIOqMCwv1n2M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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