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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f83beae882e8606a1c3f833e2dd2e8129bd11b10dc131a729aed276ac468135' 
  AND token = 'rrWsQJ9Uz5S0dXVUX9NXCAO8jLZ3TtZiIVx0I85jhWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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