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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7b83a72ef0710bf5f33b7b01c9a0a19f56081fdff3804b33c4ab0ffd0fa2d3' 
  AND token = 'zp7A8ljzZDmpfa1rlCpZ5S5kzP5X4qOG5TPLA8AFdiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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