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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c448f7745d3b0e71e0fa661d1e3b6d7dc6662c8c22271f00528b4322b4828adb' 
  AND token = 'Qn+1b+NUDGHVu25BCMSnSYci5UgJL/a1s2/gXP/Gpn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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