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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca877e3fa1c2ff5f862e05c33635c39d1c20078caf0cf3e43974aa745a1deea9' 
  AND token = 'rCf2TKtFsKRs0Pnpn4pj1tn29CwHkoWT4nS6C+U47EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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