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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a537f0b6e66a9c8be05a0f154233f805071f46e03151d40f2a1cea3ac569ec73' 
  AND token = 'Qeleqzno66pjWs3Wv1cBtxNdcQpii4p6/6YSGoxo5d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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