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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08a7883d70ec33de666c149a30df398226a883d033de26d6e947b4c9637f3bb' 
  AND token = '19OGpW/WkHt+7NtLzeCZfJ9jrznVgbUCa/280tlVpYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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