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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a723b4d93a752aa6448a34d0440a800ffd93588189cd1a3718bbeec48d5e8be' 
  AND token = 'E2+ZICfc+bRteLwhlcExzr71zHnLm1WCcLWp0Nk4afs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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