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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892e36a3d0e7554cb18267027300cc70c6aa8691e543dac73983cbf71c3e6a37' 
  AND token = 'pH7bHLBIwbhQsg+pdu/v/MIbR+FAKZ61T8yIfp74Qgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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