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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d6ce3686a80f09dfa88ae26ea7268f3a640e7b14f58e6f3895290248487512' 
  AND token = 'AX8/E16istTurpNYMK/3DGEwEHkTtwbG3GtP4dHlBbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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