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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284330b5f48127795f6c2b623621cee703bf3ee06cac9523fe49a2498c983c69' 
  AND token = 'IaW2FzXJhf6L3dTaBoyXl7Z5DtJQwJalMB1k/ODSl30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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