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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3db1d71c018eb8469470aa055cecdd187ab7cc4dbb56485cb66a4514d87e6b' 
  AND token = 'LiG4nvoefTBgBQY9TOsR+czLsEp2qOb6Z6wqAicee4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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