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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca37affae698e78c3bf2c5c784c61566ccea73ee34a8f82b9f4de0acff48eb6f' 
  AND token = 'H/7+eSW0NOGLjZ9TRoQd09mRPcNjd4Aclr401m67LGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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