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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db141005a6a115b36e55d065d355730fa11465a3997b965f84dd46d186f02f1a' 
  AND token = 'jo2P0wQORfsQLeU5Gv0iZgUWywScPqZa68owcaDsO0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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