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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73088887fe096bfc201db6717d3947d9c50ff7e2cc39a16b105e46fba727b63f' 
  AND token = '2WSEQgqbuLXxP8mjnyTkSMlDyuiEdaHys5OO6Ynma38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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