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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e008c9e843b10c2fa239ce0905941086d3953b94021ea08928610d84f9fb6c' 
  AND token = 'K0w2HUHOO1+/Lne4h4fTHkNT8gtsa9daLHBSliTtnmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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