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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89c17f70aa7870ed09a5dd74963eff04b78b854bb7cb45ef7e06874236c90f2' 
  AND token = 'Ojs3XcwLVvF2BTOEC5iJM1f7r2O08/y0OR5ZE1x13bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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