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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2923d44501ebd19e8d655ecb344a56b0201bbbf610ec57e11fcd5c8a144d0140' 
  AND token = 'qeGHP1KzItyQp90ABImDiH2XHT5+wFAoGa4Kb86Byrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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