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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b6698f84fa5a18ad267f502a1252d32db7f9ba33dcbf329f390717bba43331' 
  AND token = 'PDLAyyaE2hb/pPkfU1M3ItHobCDDP4803i8HdsF3AHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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