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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebc1c2940aaac689bc958dde6b5cbb8f5a31f1d3982ef6183496037e06d2ed7' 
  AND token = 'X501PmOz8tQebz10COYLchcDpcP4A7PLPqpf4xikkoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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