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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85b0f66419f3ab331b7a934780bd54a4da107cfd238e62702c175906c46b109' 
  AND token = 'B5ZAfHfZ9PWHIIs8m61zhvqCkIbG6n68KI4zUE1it7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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