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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4677b9c39d2f5873dce12e20372b096839ba4b08df3f1f1263dcb16a256690' 
  AND token = '0HaVM/Yo4F5AD0z27u1XQg8Mok59OdUT39hub1VB8jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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