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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b34e43e1dae804e619f498c715cf886e96dfaf5c9d09e951fb3485e15879ee' 
  AND token = 'vhvz8rCVdp+zJ3hS35jl1RisTyfu/RYJslqlUgxf2Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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