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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25679fe65e863322d5e5d0a3b2b46909695adb94d25393aa8219bfa3251e8bc9' 
  AND token = 'nWzq3i/EVKWF5cRhTJ4ssNkh/JtGSz9YxYKGTIdi04I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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