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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb34e3be0bc10756f4f8149444979cf545c0f47b492a3dd579e2bf752e31157f' 
  AND token = 'Ejb/lWRrnvjgij3lSFlIcGeQkpiRhSnyL2tU6ycQewk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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