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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10edc85d14303f1eef5f15ccef4b19f170efbffb07ecf849e57bc8c55db13540' 
  AND token = 'ZMrOOsk7SElVbQTnXUB89Ra6X4Ilbfa55ZyFUf/4DBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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